Cook 400 g rice (a rice-cooker is useful). Normally you should use Japanese round rice, but for this adapted recipe, it's not absolutely necessary.
Meanwhile, pour 150 ml rice vinegar into a pan, bring to the boil and add 1 tablespoon salt and 1 teaspoon caster sugar, stir to mix and remove from heat.
Equally, if you don't have rice wine vinegar, use normal vinegar instead, white or wine vinegar, (in which case your rice will take on a pretty light pink colour).